Buttonhole sewing machine



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BUTTONHOLE SEWING MACHINE Original Filed Dec. 26, 1934 18 Sheets-Sheet18 A TTORNEY Patented Oct. 6, 1936 UNITED, STATES PATENT OFFICEBUTTONHOLE SEWING MACHINE Edward B. Allen and Maurice D. Knox, Newtown.Conn., assignors to The Singer Manufacturing Company, Elizabeth, N. 1.,a corporation of New Jersey 9 Claims.

This invention relates to buttonhole sewing machines, more particularlyof the automatic lock-stitch "straight type, commonly used for sewingbuttonholes in white goods such as mens shirts, collars, cuffs and thelike.

In United States Patent No. 1,966,432, of July 17, 1934, there isdisclosed rotary-hook lockstitch mechanism capable of so handling theneedle-thread loops and bobbin-thread that pyramid purl buttonholes maybe accurately sewn at rates as high as 3000 stitches per minute.

An object of the present invention is to provide an automatic straightbuttonhole sewing machine, the various cooperative parts and devices ofwhich are so improved and coordinated as to be commensurate inefliciency and speed with the rotary hook and bobbin-thread-handlingmechanisms of said Patent No. 1,966,432, with which they are caused towork in harmony.

The invention further aims to provide the machine with improvedthread-cutting mechanism and devices ancillary thereto.

With the above and other objects in view, as will hereinafter appear,the invention comprises the devices, combinations, and arrangements ofparts hereinafter set forth and illustrated in the accompanying drawingsof a preferred embodiment of the invention from which the severalfeatures of the invention and the advantages attained thereby will bereadily understood by those skilled in the art.

The present application is a division of our copending applicationSerial No. 759,200, filed Dec. 26, 1934.

In the accompanying drawings, Fig. 1 is a right side elevation, partlyin section, of a button-hole sewing machine embodying the invention.Fig. 2 is a left side elevation of the machine. Fig. 2* is a similarview of the mechanism at the lower end of the tilting stop-motion leverfor the sewing mechanism of the machine, showing such lever latched inits tilted or running position. Fig. 3 is a bottom plan view of themachine. Fig. 3*.is a detail bottom plan view of a part of Fig. 3. Fig.4 is a horizontal sectional view through the bracket-arm standard of themachine, showing the machine bed in plan. Fig. 4 is a detail plan viewof the stitch-gear adjusting bracket shown in Fig. 4. Fig. 4 is asection on the line 9-4, Fig. 4 Fig. 5 is a rear end elevation of themachine. Fig. 5 is a disassembled perspective view of a connectionbetween the top of the sewing stop-motion lever and a latch-tripping rodfor the upper threadcutter and -nipper release mechanism. Fig. 5

is a detail sectional view of an element of Fig. 5. Fig. 6 is a faceview of the sewing stop-motion buffer spring and its carrier. Fig. 7 isa perspective view of the notched stop-cam of the sewing stop-motiondevice. Fig. 8 is a front end elevation of the machine. Fig. 9 is avertical section through the pendulous needle-bar carrier or gate.

Figs. 10 and 11 are respectively enlarged face and vertical sectionalviews of the needle-thread tension device shown at the lower end of thebracket-arm head in Fig. 8. Fig. 12 is a horizontal sectional viewthrough the overhanging bracket-arm of the machine. Fig. 13 is a sectionon the line l3-l3, Fig. 1. Fig. 14 is a section on the line H-H, Fig.13. Fig. 15 is a perspective view of the actuating cam of the upperthread-cutter and -nipper release mechanism. Fig. 16 is a plan view ofthe forward end portion of the machine bed with the work-clamp removed.Fig. 17 is a vertical section through the machine bed and bracket-armstandard on the line lI-I'l, Fig. 1. Fig. 18 is a section on the lineIii-l8, Fig. 1. Fig. 19 is a disassembled elevation of certain smallparts shown in Fig. 16.

Fig. 20 is a left side elevation, partly in section, of the connectionswith feed-cam for imparting to the work-clamp its travelling movementslengthwise of the machine bed. Fig. 21 is a section on the line 2 l2i,Fig. 16. Fig. 22 is a horizontal section on the line 22-22, Fig. 1, buton a larger scale. Fig. 23 is a section on the line 23-23, Fig. 22. Fig.24 is a perspective view of the inner face of the needle-bar-vibratingcrank-head shown in Figs. 22 and 23. Fig. 25 is a bottom face view ofthe feed-cam. Fig. 26 is aperspective view of the cam which controls thefield or center line of vibration of the needle. Fig. 27 is a transversevertical section through the machine bed on the line 21-21, Fig. 4. Fig.28 is a section on the line 28-28, Fig. 16, Fig. 29 is a section on theline 29-29, Fig. 3.

Fig. 30 is a fragmentary vertical section on the line 30-30, Fig. 1.Fig. 3 1 is a longitudinal vertical section through the forwardend-portion of the needle-throat-plate of the machine, showing the undernipper for the needle-thread; the nip per being open or in position toreceive the needle on its first descent in the sewing of a buttonhole.Fig. 31 is a similar view showing the nipper closed on the beginning endof the needle-thread after the needle has risen clear of the work andthe take-up lever has reached the top of its first up-stroke. Fig. 32 isa transverse section through the throat-plate on the line 32-42, Fig.31. Fig. 33 is a section substantially on the line sectionlongitudinally oi the machine bed at the rearward end thereof adjacentthe bracket-arm standard on the line 34-34, Fig. 3. Fig. 35 is a similarsectional view on the line 35-45, Fig. 3. Fig. 36 is a horizontalsectional view through the one-rotation clutch mechanism for driving theauxiliary shaft of the machine which drives the work-clamp closing andopening mechanism the buttonhole-cutting mechanism and various othermechanisms auxiliary to the stitch-forming mechanism in the buttonholeproducing cycle. Fig. 37 is a face view of the driven or bottom elementof the clutch shown in Fig. 36. Fig. 38 is a face view of the live ortop clutch-element shown in Fig. 36. Fig. 39 is a perspective view ofthe clutch-controlling gate.

Fig. 40 is a disassembled perspective view of parts of the drivenclutch-element. Fig. 41 is a longitudinal vertical sectional viewthrough the work-clamp, showing the operating mechanism for the upperthread-cutter and -nipper. Fig. 42 is a section on the line 42-42, Fig.41. Fig. 43 is a section on the line 43-43, Fig. 42. Fig. 44 is asection on the line 46-, Fig. 2. Fig. 45 is a section on the line 45-45,Fig. 44. Figs. 46, 47 and 48 are, respectively, transverse verticalsectional views on the lines 46-46, 41-41 and 46-48, Fig. 16. Fig. 49 isa sectional view on the line 49-46, Fig. 16.

Fig. 50 is a vertical sectional view through the front hook-shaftbearing showing the bobbinthread pull-off driving connections. Fig. 51is a fragmentary left side elevational view of the clampclosing-and-opening and buttonhole-cutting mechanisms. Fig. 51 is asectional view of the element of Fig. 51. Fig. 52 is a top plan view ofthe rotary hook and bobbin-thread pullofl devices. Fig. 53 is afragmentary right side elevation of the needle, rotary hook andbobbinthread pull-oi! devices. Fig. 54 is a perspective view of thebobbin-thread-nipper and -cutter. Fig. 55 is a perspective view of thelatch which controls the opening and closing movements of thebobbin-thread-nipper and -cutter. Figs 56 and 56" are, respectively, topand bottom perspective views of the throat-plate. Fig. 57 is adisassembled perspective view of the under n'eedle-thread-"nipper. Fig.58 is a top plan view of the bobbin-thread-nipper and -cutter advancingand opening to seize and cut the bobbinthread at the end of a sewingperiod. Fig. 59 is a front elevation, partly in section, of the partsshown in Fig. 58.

Fig. 60 is a view similar to Fig. 58 with the bobbin-thread-cutter and-nipper almost fully advanced and about to close upon the bobbinthread.Fig. 61 is a front elevation, partly in section, of the parts shown inFig. 60. Fig. 62 shows the bobbin-thread-cutter and -nipper fullyadvanced and closed upon the bobbin-thread. Fig. 63 is a frontelevation, partly in section, of the parts shown in Fig. 62. Fig. 64shows the closed bobbin-thread-nipper and -cutter, fully retracted topull off a measured length of bobbinthread for the beginning of the nextsewing operation. Fig. 65 is a front elevation, partly in section, ofthe parts shown in Fig. 64, the bobbinthread-cutter and -ni.pper beingalso shown in dotted lines in its subsequently partially advancedposition to slacken the bobbin-thread so that it may be easily pulled toposition in the work by the first needle-loop to be tightened in thenext sewing operation. Fig. 66 is a transverse section through thebobbin-thread-cutter and 33-43, Fig. 4. Fig. 34 is a fragmentaryvertical -nipper. Fig. 67 shows the parts of the needle- 7thread-controlling mechanism at the end of a The machine frame comprisesa box-like bed or casing I on top of which is secured the standand 2 ofthe overhanging bracket-arm I tenninating in the head 4. The space abovethe bed I and under the overhanging portion of the bracket-arm Iconstitutes a work-receiving throat and it is within this throat thatthe workclamp of the machine is customarily mounted for step-by-steptravelling movements longitudinally of the bed I to distribute thestitches lengthwise of the buttonhole being produced. The presentwork-clamp is so constructed that almost the entire depth of the throatof the frame is available for reception of work and the machine is thuswell adapted for sewing buttonholes in shirt bosoms. The standard andbracket-arm have open sides and coplanar inner vertical webs 2', 3, theopen sides being closed by removable cover-plates 3 and 3'', Fig. 17.

Stitch donning mechanism The main sewing shaft 5 of the machine isjournaled in the bracket-arm I and at its forward end carries the usualcrank 6 connected by the link I to the reciprocatory needle-bar Icarrying the eye-pointed needle 9. The needle-bar 8 is mounted forendwise reciprocation in the pendulous carrier or gate I0, Figs. 8 and9, suspended from the pivot II and vibrated transdescribed.

Mounted on the main sewing shaft 5 is a bevelgear I2, Fig. 1, whichmeshes with the bevelgear I2 fixed to the vertical shaft II to the lowerend of which is fixed the bevel-gear I4 meshing with the bevel-gear IIon the lower horizontal shaft I6 carrying at its forward end the rotaryhook I! which cooperates with the needle 9 to form stitches.

The rotary hook I'I embraces the stationary bobbin-case I6 which isjournaled within it and is restrained against rotation by theindependently oscillatory fingers I9, 26, Fig. 8,'received in thenotches 2|, in the thread-case. The bobbincase I8 carries the usualbobbin 2! of under thread. The fingers I9, III are carried by therespective parallel rock-shafts 23, 24 which are oscillated one at atime, to clear the bobbin-case in the loop-casting operation, by therespective cam-followers 26. 26 in engagement with the respective cams21, 26 on the cam-shaft 29 connected by gears 30 to the hook-shaft l6 torun at half the speed of the latter. The present rotary hook andbobbin-case devices, as well as the cammechanism for operating theopenable rotationrestraining fingers I 8, 20 are constructedsubstantially in accordance with the disclosure of said U. 8. Patent No.1,966,432. While any of the usual loop-taking mechanisms may be used,the particular loop-taking mechanism disclosed is preferred because ofthe extreme ease and freedom with which the needle-loops are passedthereby around the bobbin-case at high operative speeds.

The vertical sewing shaft II, Fig. 18, carries a pinion 3| which drivesthe gear 32 on the short vertical shaft 33 to the lower end of which isfixed the head 34 carrying the diametrically opposed

